Improvement in grinding-m ills



No. 56,246. Patented July 10, 1866.

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Witnesses: v Inventor: v

UNITED STATES PATENT OFFICE,

JAMES W. MILES, OF HUBBARDSTON VILLAGE, MICHIGAN.

IMPROVEMENT IN GRINDING-MILLS.

Specification forming part of Letters Patent No. 56,2416, at d Ju y 1 1llte July 1866- To all whom it may concern:

Be it known that 1, JAMES W. MILES, of the village of Hubbardston, NorthPlains township, in the county of Ionia and State of Michigan, haveinvented a new and useful Improvement in Millstone-Drivers; and I dohereby declare that the following is a full, clear, and exactdescription of the same, reference being had to the annexed drawings,making a part of this specification, in which Figure 1 represents thedriver, in plan, upside down, the cover being detached. Fig. 2 is across-section in the line :11.

Similar letters indicate corresponding parts in both of the figures.

The object of my invention is to transmit the driving power from amill-spindle to the runner in such manner as to better divide andequalize resistance at the driving points, and at the same time permitthe freest possible vibration to the stone; and it consists in theemployment of an annular casing in connection with elastic stops andjointed bars; and the better to enable others skilled in the art toconstruct and use my invention, I will now proceed more minutely todescribe the same.

A represents a metal ring whose interior diameter corresponds with thatof the eye of the stone. I usually make this ring of a rectangular formin cross-section; but it may be made of any suitable form, divided intoas many channels or hollow compartments as will correspond with therequired number of bearing-points. In each of these compartments asliding block, B, proportionally shorter than such compartment, isloosely fitted, and the spaces between each end of said block and thecontiguous abutments or partitions, as seen at a a, are occupied by'somesufficiently durable and elastic material, such as vulcanizedsheet-rubber folded in corrugations, as exhibited at D, or, in placethereof, solid rubber may be advantageously used, or metal springs ofany of the known suitable forms.

0 represents a metal sleeve fitted to the mill-spindle S, (shown asbroken ofi below,) said sleeve being provided with keyways to match thesplines c, with which the spindle is furnished. As this sleeve is liftedofi from the spindle Whenever the stone is taken up, it must have asnug, yet free sliding fit.

M is a detachable cover, bolted at m to the ring-ears I.

The ring A is maintained concentric with the sleeve and spindle by thejointed drivingbars F, the outer ends of which pass through slots (notseen) in the inner wall of the ring and through slots in the slidingblocks B, to which they are jointed by pins 29, and the inner ends arejointed to elongated portions cof the sleeve by the pins 19 so as tobring the line of the driving-bars as nearly tangential with the ring asmay be practicable and convenient.

H represents the bale, to which the ring A is firmly bolted through theears I, said bail being secured in the eye of the runner and hung uponthe cock-head J of the spindle in the usual manner.

I will say here that although I have described and illustrated myimproved driver as operated by three driving-bars, which necessitates athree-pronged bail, yet in practice from two to'four bars may be used,and with a bail of the ordinary construction attached to the ring andstone at two opposite points.

When the several parts are connected to each other and to the stone, asherein described, and the stone properly hung and balanced upon itsspindle, it will be seen that when the spindle is revolved thedriving-bars F draw or push the sliding blocks B against the elasticabutments at D, and revolve the stone in such manner that itswell-balanced equilibrium cannot be impaired when running, even if thespindle should not be in exact tram with the bed-stone, which it hardlyever is. This result is effected by the self-adjusted equalization ofpressure due to the elastic bearings combined with the vertical play inthe jointed driving-bars.

I am aware that some use rollers between rigid driving-bearings in orderto prevent cramping the runner when the spindle was not in perfect tram,and that various devices have been employed to equalize thebearingpressure at opposite points; but all these contrivances have beenonly measurably successful, because the friction or adhesion was onlypartially removed, or the equilibrium of the meansof jointeddriving-bars F, operating tanr stone only preserved at definite pointsand gentially against elastic bearings D, or their not (luring the Wholerevolution and at all equivalents, substantially in the manner andpoints of the stone. for the purpose as herein described and set Havingthus described my invention, what forth. I claim, and desire to secureby Letters Pat- JAMES W. MILES. a ent, is- Witnesses:

Transmitting motion from the driving-power GEORGE JOHNSON, through themill-spindle to the runner by GEORGE F. MORRIS.

